The devotee can worship all the planets as presiding deities.The SUN is the prime deity. Usha devi and Sri Purusha devi(Chaya devi) are the consorts.
Sun god holds two lotus flowers in his hands It is king of kings in the Navagraha planets.Sage Kalava Muni was suffering from severe leprosy. He worshipped all the planets begging total cure. All the planets graced the Rishi with what he wanted – the cure from leprosy.
Lord Brahmma strongly objected to the response of the planets to Rishis penance on the ground that in accordance with the orders of Lord Shiva, the planets were to give the effects of good and evil deeds of the individuals and that that the planets had violated this rule by directly giving boons to a devotee and cursed them to suffer from leprosy themselves.
The planets came down to a white wild flower jungle (Vellerukku vanam) and performed penance on Lord Shiva for relief. Stay there offer worship from the first Sunday of Tamil month Karthigai for 12 weeks in total of 78 days on Mondays, they have to take bath before sunrise in Cauvery and offer prayers to Prarivaradhan and MangalaNayaki with in 2 1/2hours after sunrise, they have to have curdrice in ‘Arka leaf’ and eat the same.
On the other days they have to be in fast to release themselves from the punishment. Lord appeared before them and said that the place belonged to them and allowed them to grace the devotees worshipping them enduring a variety of hardships.